linux-kernel - Re: [PATCH] arm64: dts: meson-a1: add I2C nodes

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Date:   Mon, 09 Dec 2019 14:54:18 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Jian Hu <jian.hu@...ogic.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Jian Hu <jian.hu@...ogic.com>, "Rob Herring" <robh@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Michael Turquette <mturquette@...libre.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mark Rutland <mark.rutland@....com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        linux-amlogic@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: meson-a1: add I2C nodes

Hi Jian,

Jian Hu <jian.hu@...ogic.com> writes:

> There are four I2C controllers in A1 series,
> Share the same comptible with AXG.The I2C nodes
> depend on pinmux and clock controller.
>
> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
> ---
>  arch/arm64/boot/dts/amlogic/meson-a1.dtsi | 149 ++++++++++++++++++++++
>  1 file changed, 149 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> index eab2ecd36aa8..d0a73d953f5e 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> @@ -16,6 +16,13 @@
>  	#address-cells = <2>;
>  	#size-cells = <2>;
>  
> +	aliases {
> +		i2c0 = &i2c0;
> +		i2c1 = &i2c1;
> +		i2c2 = &i2c2;
> +		i2c3 = &i2c3;
> +	};
> +
>  	cpus {
>  		#address-cells = <2>;
>  		#size-cells = <0>;
> @@ -117,6 +124,46 @@
>  				};
>  			};
>  
> +			i2c0: i2c@...0 {
> +				compatible = "amlogic,meson-axg-i2c";
> +				reg = <0x0 0x1400 0x0 0x24>;

The AXG DT files use 0x20 for the length.  You are using 0x24.  I don't
see any additional registers added to the driver, so this doesn't look right.

> +				interrupts = <GIC_SPI 32 IRQ_TYPE_EDGE_RISING>;
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				clocks = <&clkc_periphs CLKID_I2C_M_A>;
> +				status = "disabled";
> +			};
> +
> +			i2c1: i2c@...0 {
> +				compatible = "amlogic,meson-axg-i2c";
> +				reg = <0x0 0x5c00 0x0 0x24>;
> +				interrupts = <GIC_SPI 68 IRQ_TYPE_EDGE_RISING>;
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				clocks = <&clkc_periphs CLKID_I2C_M_B>;
> +				status = "disabled";
> +			};
> +
> +			i2c2: i2c@...0 {
> +				compatible = "amlogic,meson-axg-i2c";
> +				reg = <0x0 0x6800 0x0 0x24>;
> +				interrupts = <GIC_SPI 76 IRQ_TYPE_EDGE_RISING>;
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				clocks = <&clkc_periphs CLKID_I2C_M_C>;
> +				status = "disabled";
> +			};
> +
> +			i2c3: i2c@...0 {
> +				compatible = "amlogic,meson-axg-i2c";
> +				reg = <0x0 0x6c00 0x0 0x24>;
> +				interrupts = <GIC_SPI 78 IRQ_TYPE_EDGE_RISING>;
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				clocks = <&clkc_periphs CLKID_I2C_M_D>;
> +				status = "disabled";
> +			};
> +
>  			uart_AO: serial@...0 {
>  				compatible = "amlogic,meson-gx-uart",
>  					     "amlogic,meson-ao-uart";
> @@ -171,3 +218,105 @@
>  		#clock-cells = <0>;
>  	};
>  };
> +
> +&periphs_pinctrl {
> +	i2c0_f11_pins:i2c0-f11 {
> +		mux {
> +			groups = "i2c0_sck_f11",
> +				"i2c0_sda_f12";
> +			function = "i2c0";
> +			bias-pull-up;
> +			drive-strength-microamp = <3000>;

Can you also add some comment to the changelog about the need for
drive-strength compared to AXG.

> +		};
> +	};

Kevin